Fossarus is a genus of sea snails, marine gastropod mollusks in the family Planaxidae. Species Species within the genus Fossarus include: Fossarus abjectus (C.B. Adams, 1852) Fossarus ambiguus (Linnaeus, 1758) Fossarus angiostoma (C.B. Adams, 1852) Fossarus angulatus Carpenter, 1857 Fossarus atratus (C.B. Adams, 1852) Fossarus beccarii (Tapparone Canefri, 1875) Fossarus bellus Dall, 1889 Fossarus brumalis Hedley, 1907 Fossarus cancellarius Melvill, 1918 Fossarus capensis Pilsbry, 1901 Fossarus cereus Watson, 1880 Fossarus cumingii (A. Adams, 1855) Fossarus dentifer E. A. Smith, 1890 Fossarus elegans Verrill & Smith, 1882 Fossarus erythraoensis: taxon inquirendum Fossarus eutorniscus Melvill, 1918 Fossarus excavatus (C.B. Adams, 1852) Fossarus fischeri Mörch, 1877 Fossarus foveatus (C.B. Adams, 1852) Fossarus garrettii Pease, 1868 Fossarus guayaquilensis Bartsch, 1928 Fossarus japonicus (A. Adams, 1861) Fossarus laeviusculus E. A. Smith, 1890 Fossarus lamellosus Mountrouzier, 1861 Fossarus lucanus Dall, 1919 Fossarus lui S.-I Huang, 2012 Fossarus macmurdensis (Hedley, 1911) Fossarus mediocris de Folin, 1867 Fossarus megasoma (C.B. Adams, 1852) Fossarus orbignyi P. Fischer, 1864 Fossarus porcatus (Philippi, 1845) Fossarus purus Carpenter, 1864 Fossarus sydneyensis Hedley, 1900 Fossarus tornatilis (Gould, 1859) Fossarus translucens Barnard, 1969 Fossarus trochlearis A. Adams, 1853 Fossarus tuberosus Carpenter, 1857 Species brought into synonymy Fossarus adansoni Philippi, 1841: synonym of Fossarus ambiguus (Linnaeus, 1758) Fossarus aptus Melvill, 1912: synonym of Fossarus ambiguus (Linnaeus, 1758) Fossarus bulimoides Tenison Woods, 1877: synonym of Leucotina casta (A. Adams, 1853) Fossarus clathratus Philippi, 1844: synonym of Clathrella clathrata (Philippi, 1844) Fossarus (Gottoina) compacta Dall, 1889: synonym of Haplocochlias compactus (Dall, 1889) Fossarus depressus Seguenza, 1876: synonym of Megalomphalus disciformis (Granata-Grillo, 1877) Fossarus disciformis Granata-Grillo, 1877: synonym of Megalomphalus disciformis (Granata-Grillo, 1877) Fossarius doliaris A. Adams, 1863: synonym of Conradia doliaris A. Adams, 1863 Fossarus excavatus Gaglini, 1987: synonym of Rugulina monterosatoi (van Aartsen & Bogi, 1987) Fossarus globulosus Turton, 1932: synonym of Couthouyia incerta (Turton, 1932) Fossarus granulum Brugnone, 1873: synonym of Pseudorbis granulum (Brugnone, 1873) Fossarus hyalinus Odhner, 1924: synonym of Scrupus hyalinus (Odhner, 1924) Fossarus incertus Turton, 1932: synonym of Couthouyia incerta (Turton, 1932) Fossarus iwateanus Nomura & Hatai, 1935: synonym of Phasianema lirata (A. Adams, 1860) Fossarus lanoei Baudon, 1857: synonym of Fossarus ambiguus (Linnaeus, 1758) Fossarus monterosati Granata-Grillo, 1877: synonym of Tjaernoeia exquisita (Jeffreys, 1883) Fossarus parcipictus Carpenter, 1864: synonym of Echinolittorina parcipicta (Carpenter, 1864) Fossarus petitianus Tiberi, 1869: synonym of Megalomphalus petitianus (Tiberi, 1869) Fossarus saxicola (C.B. Adams, 1852): synonym of Elachisina saxicola (C. B. Adams, 1852) Fossarus yamamotoi Habe, 1978: